Taking it easy in Rome on vacation with pop star (7)
I believe the answer is:
resting
'taking it easy' is the definition.
(I've seen this before)
'rome on vacation with pop star' is the wordplay.
'on vacation' suggests removing the centre.
'with' means one lot of letters go next to another.
'pop star' becomes 'sting'.
'rome' with its centre removed is 're'.
're'+'sting'='RESTING'
'in' is the link.
(Other definitions for resting that I've seen before include "Out of work (acting)" , "not in a cast" , "Relaxing from work" , "Reposing" , "Taking a break" .)